Turbine eccentricity refers to a condition in which the rotating components of a turbine, such as the rotor, are not perfectly centred within the surrounding stationary components, such as the casing or stator. This lack of concentricity can lead to several issues in turbine operations, including:
1.)
Vibration: Eccentricity
can cause uneven forces and imbalances during rotation, leading to increased vibration
levels. Excessive vibration can result in equipment damage, reduced efficiency,
and potential safety hazards.
2.)
Increased Wear:
Uneven contact between rotating and stationary components due to eccentricity
can lead to accelerated wear and tear on turbine parts. This can result in decreased
reliability and increased maintenance requirements.
3.)
Efficiency Loss:
Turbine efficiency may be compromised because of eccentricity, as it can lead
to inefficient energy transfer between components and increased frictional
losses.
4.)
Instability:
In extreme cases, turbine eccentricity can cause instability in turbine
operation, leading to operational issues and potential damage to the turbine
and associated equipment.
To prevent or mitigate turbine eccentricity, proper design, manufacturing,
and maintenance practises are essential. Regular inspection and alignment of
turbine components can help identify and address eccentricity issues before
they lead to significant problems. For a turbine on turning gear, an eccentricity
of less than 50 mm prior start-up is desirable.
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